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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Liver

AST (Aspartate Aminotransferase)

AST is an enzyme found in muscles and the liver, making it particularly relevant for active individuals. Intense training, resistance exercise, and performance supplements can all raise AST levels, so regular monitoring helps distinguish training-related elevations from potential health concerns.

Reference Ranges

Male
u/l
Normal < 35 High
Female
u/l
Normal < 31 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

AST is an enzyme involved in amino acid metabolism, found in the liver, heart, skeletal muscles, kidneys, and brain. When cells in these organs are damaged, AST is released into the bloodstream.

This test measures the concentration of AST in your blood. Unlike ALT, which is more liver-specific, elevated AST can originate from multiple tissues. The AST:ALT ratio is often used to help differentiate between causes of liver enzyme elevation.

Why It Matters

AST levels provide important information about the health of your liver, heart, and muscles. Elevated levels may be associated with conditions such as hepatitis, cirrhosis, heart attack, or muscle injury.

When evaluated alongside ALT, the AST:ALT ratio can help your healthcare provider identify the underlying cause of liver enzyme elevation. An AST:ALT ratio greater than 2:1, for instance, may suggest alcohol-related liver damage.

When to Test

Testing may be recommended as part of a liver function panel, when liver disease is suspected, or when monitoring the effects of medications that may affect the liver.

AST testing may also be indicated after a suspected heart attack, in cases of unexplained muscle pain, or when evaluating symptoms such as fatigue, jaundice, or abdominal discomfort.

Symptoms

Low Levels

Low AST levels are generally not clinically significant and typically indicate normal cellular function in the liver, heart, and muscles.

High Levels

Fatigue and general weakness
Jaundice (yellowing of skin or eyes)
Abdominal pain, particularly in the upper right area
Dark urine
Nausea or loss of appetite

Recommendations

Male

If Low

Normal AST indicates healthy liver and heart function. Maintain healthy lifestyle habits.

If High

Elevated AST may indicate liver or heart muscle damage. Consider further evaluation including imaging and additional liver tests.

Female

If Low

Normal AST indicates healthy liver and heart function. Maintain healthy lifestyle habits.

If High

Elevated AST may indicate liver or heart muscle damage. Consider further evaluation including imaging and additional liver tests.

Lifestyle Tips

Limit alcohol consumption, as chronic excessive drinking is a well-established cause of elevated AST levels. Maintain a healthy body weight through balanced nutrition and regular physical activity to support liver health.

Discuss all medications and supplements with your healthcare provider, as some may contribute to elevated liver enzymes. Allow adequate recovery time between intense exercise sessions, as vigorous physical activity can temporarily raise AST levels.

Frequently Asked Questions

What is the difference between AST and ALT?
Both are liver enzymes, but ALT is more specific to the liver, while AST is also found in the heart, muscles, and other organs. When both are elevated, the AST:ALT ratio can help determine the underlying cause. Consult your healthcare provider for proper interpretation.
Can exercise raise AST levels?
Yes, intense or prolonged physical activity can temporarily elevate AST levels due to muscle cell breakdown. If you exercise regularly, inform your healthcare provider, as this may influence interpretation of your results.
How often should AST be tested?
The frequency depends on your individual health profile. For routine monitoring, annual testing may be appropriate. If you have known liver conditions, take hepatotoxic medications, or consume alcohol regularly, more frequent testing may be recommended.

Test Products

This marker is included in the following test panels.

Health Checkups

InsideTracker

A 36-biomarker performance and longevity panel inspired by InsideTracker Ultimate — covering heart, hormones, metabolism, inflammation, recovery and iron status.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Magnesium (Intracellular) Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Complete Blood Count (CBC)
€399,-
Hormones & TRT

TRT Monitoring

Monitoring panel for testosterone replacement therapy: hormones, liver, lipids, PSA, and blood count.

PSA (Prostate-Specific Antigen) Prolactin ALT (Alanine Aminotransferase) Triglycerides ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) GGT (Gamma-Glutamyl Transferase) LDL Cholesterol SHBG (Sex Hormone Binding Globulin) Estradiol (E2) Free Testosterone Total Testosterone HDL Cholesterol Albumin Complete Blood Count (CBC)
€250,-

Whoop

A 44-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Complete Blood Count (CBC)
€499,-